Develop Reference

Ajax insert data not returning response - PHP & MySQL

I am working on a scanner reader, so I used ajax when the code is read by the scanner, it should insert data to the database. The problem is the data is not inserting.
Inside the script / Ajax - query is the variable I used to get the data (name)
var query = $('#scanned-QR').val();
fetch_customer_data(query);
$(document).on('keyup', '#scanned-QR', function(){
var query = $(this).val();
fetch_customer_data(query);
});
function fetch_customer_data(query = '')
{
$.ajax({
url:"validScan.php",
method: 'GET',
data:{query:query},
dataType: 'json',
success:function(data) {
console.log(data);
if (data.status == '1') {
decoder.stop();
alert('Sucess!');
}
else if(data.status=='0'){
decoder.stop();
alert('Fail!');
}
},
error:function(err){
console.log(err);
}
});
}
My Input/Textarea
<textarea id="scanned-QR" name="scanQR" readonly></textarea>
MySQL
<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
$link = mysqli_connect("localhost","root","");
mysqli_select_db($link, "schedule");
$query = $_GET['query'];
$res = mysqli_query($link,"INSERT INTO attendance (name) VALUES ('$query')");
if (mysqli_num_rows($res) > 0) {
$respose = array('status'=>'1');//1 for success
echo json_encode($respose );
} else {
$respose = array('status'=>'0');//0 for fail
echo json_encode($respose );
}
mysqli_close($link);
?>

For insert query, result will return as boolean, So mysqli_num_rows($res) won't accept boolean argument. mysqli_num_rows() expects parameter 1 to be mysqli_result
So you can simply check by below, whether it is inserted or not:
if ($res) {
$respose = array('status'=>'1');//1 for success
echo json_encode($respose);
exit;
} else {
$respose = array('status'=>'0');//0 for fail
echo json_encode($respose);
exit;
}
mysqli_close($link);

You should use exit try following code :
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
$link = mysqli_connect("localhost","root","");
mysqli_select_db($link, "schedule");
$query = $_GET['query'];
$res = mysqli_query($link,"INSERT INTO attendance (name) VALUES ('$query')");
if (mysqli_num_rows($res) > 0) {
$respose = array('status'=>'1');//1 for success
echo json_encode($respose );
exit;
} else {
$respose = array('status'=>'0');//0 for fail
echo json_encode($respose );
exit;
}
mysqli_close($link);
exit;

mysqli_num_rows() is for getting the number of rows returned from a SELECT query. You need to check the number of affected rows instead.
You should also be using a prepared statement, and I also recommend that you set up MySQLi to throw errors. I also prefer the object-oriented approach.
<?php
// Configure MySQLi to throw exceptions on failure
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
// Init connection
$link = new mysqli("localhost", "root", "", "schedule");
$response = [];
// Prepare the statement and execute it
$stmt = $link->prepare("INSERT INTO attendance (name) VALUES (?)");
$stmt->bind_param("s", $_GET['query']);
$stmt->execute();
// Check the number of inserted rows
if ($stmt->affected_rows) {
$response['status'] = 1;
} else {
$response['status'] = 0;
}
// Close the statement and connection
$stmt->close();
$link->close();
echo json_encode($response);

Receive AJAX response from controller function defined in included file

I have a form that submits an ajax call to the controller file below which has a function defined in another file "processes.php" [that I've included]. The challenge is receiving the json response; the browser expects to find it in the controller yet it's generated within the function. How can I retrieve the response from the function and make it readable from the controller [outside its functions] so that the response can be read by the browser?
controller.php
<?php
session_start();
$_SESSION['postdata'] = $_POST;
require "constants.php";
$file = $_SESSION["Form"].".php";
require $file;
if( isset($_POST["Save"]) ){
save_record($connection);
}
process.php
<?php
$_POST = $_SESSION['postdata'];
function save_record($connection){
$errors = array(); // array to hold validation errors
$data = array(); // array to pass back data
$name = mysqli_real_escape_string($connection, $_POST["name"]);
$strQuery = "INSERT INTO names (name) VALUES ('$name')";
$result = mysqli_query($connection, $strQuery); //or exit("Error in query execution attempt!");
if($result){
$data['success'] = true;
$data['message'] = 'Success!';
}
else{
$errors['errorinexecute'] = "Error in query execution attempt!";
}
mysqli_close($connection);
unset($_SESSION["postdata"]);
if ( ! empty($errors)) {
// if there are items in our errors array, return those errors
$data['success'] = false;
$data['errors'] = $errors;
}
else{
$data['success'] = true;
$data['errors'] = $errors;
}
// return all our data to an AJAX call
echo json_encode($data);
}
?>

You can't use:
if( isset($_POST["Save"]) ){
save_record($connection);
}
when doing AJAX, so what I did is pass the button id into the JavaScript function like so:
onclick="saveInfo(this.id)"
The button id shows whether it's a "Delete", "Save", "Edit" request and so on and then from there the PHP file can read like this:
if( $buttonId == "Save" ){
save_record($connection);
}

Ajax window.location not working with PHP login Script

I have a PHP login script which executes with ajax. The ajax request now starts the session in the login successfully but the window.location function doesn't work (doesn't redirect to exporter.php) in the ajax request. Below are my codes.
php Login Script
if(isset($_POST['log_name']) && isset($_POST['log_password'])) {
$username = $_POST['log_name'];
$password = $_POST['log_password'];
$sql = $db->prepare("SELECT * FROM users WHERE uname = ?");
$sql->bindParam(1, $username, SQLITE3_TEXT);
$ret = $sql->execute();
while ($row = $ret->fetchArray(SQLITE3_ASSOC))
{
$id = $row['userid'];
$regas = $row['regas'];
$uemail = $row['uemail'];
$pword = $row['pword'];
$uname = $row['uname'];
$package = $row['package'];
if (password_verify($password, $pword))
{
$_SESSION['log_id'] = $id;
$_SESSION['log_name'] = $username;
$_SESSION['regas'] = $regas;
$_SESSION['uemail'] = $uemail;
$_SESSION['package'] = $package;
//header("Location: index.php?log_id=$id");
//echo "Sigining In...";
//die("<script>window.location='exporter.php?userid={$id}';</script>");
exit();
}
else
{
echo "Information incorrect";
exit();
}
}
}
Ajax Request
$("#submit_log").click(function() {
//e.preventDefault();
username=$("#log_name").val();
password=$("#log_password").val();
$.ajax({
type: "POST",
url: "login.php",
data: "log_name="+username+"&log_password="+password,
success: function(html){
if(html=='true') {
window.location.assign = "exporter.php";
}
else {
$(".logresult").html('Incorrect Username and Password');
}
},
beforeSend:function()
{
$(".logresult").html("Loading...")
}
});
return false;
});
Beginning part of exporter.php
session_start();
require_once ("db.php");
$db = new MyDB();
if (!isset($_SESSION['log_name']) || !isset($_SESSION['log_id']) || !isset($_SESSION['regas']))
{
header("Location: index.php");
}
What could be wrong here and how do i fix this redirecting issue please!!!.Thanks.

your php login script needs echo 'true'; according to your ajax callback.
and use location.href = "/exporter.php"; to redirect page with JavaScript

You should use like this:
window.location.href= "/exporter.php";

window.location.assign = "exporter.php";
will not work, use
window.location = "exporter.php";

You are using assign incorrectly.
window.location.assign("exporter.php")
Or you can use href instead.
window.location.href = "exporter.php";

Try using assign like this:
window.location.assign(data);
if this method not work for you let me know.
and if the Success:html is boolean then you're checking it in wrong way delete the single quotes it's not a string it is boolean datatype.

JQUERY & PHP POST - show 00 in console.log

I make this jquery to call a php file via post. I put a console.log to see the return of the Ajax. At moment return 00.
I'm not sure what it is the problem?
The code is:
$('input[type="submit"]').click(function(event){
event.preventDefault();
// Get the value of the input fields
var inputvalue = $(this).attr("value");
$.ajax({
url:"updateEstado2.php",
type:"POST",
data:{"codigo": inputvalue},
dataType:"text",
success:function(data){
console.log(data);
alert(inputvalue);
}
});
});
The PHP code:
<?php
session_start();
if(isset($_SESSION['username']) and $_SESSION['username'] != ''){
include("db_tools.php");
$conn = dbConnect("localhost", "5432", "dbname", "dbuser", "dbpass");
$estado = $_POST["estado"];
$codigo = $_POST["codigo"];
$query = "UPDATE produccion.ma_producto SET estado={$estado} WHERE codigo={$codigo}";
$result = pg_query($conn, $query);
if ($result == TRUE) {
header('Location: produccio.php');
} else {
echo "Error updating record: " . pg_last_error($conn);
}
pg_close($conn);
} else{
?><p>La sessió no està activa, si us plau ingresa aquí</p>
The alert window show the value of the variable correctly but the console.log show 0. I do not understand well...
Please Could you help me.

Please edit statement after if condition.
if ($result == TRUE) {
echo 'Done';
} else {
echo "Error updating record: " . pg_last_error($conn);
}

If statement not working in javascript/ajax

Ok so this is driving me mad. I've got 2 modal forms - login and register. Javascript does the client side validation and then an ajax call runs either a registration php file or a login php file which returns OK if successful or a specific error message indicating what was wrong (incorrect password, username already taken,etc). There is an If Then statement that checks if the return message is OK and if it is then a success message is displayed and the other fields hidden.
The register form works perfectly. I get my OK back and fields get hidden and the success message displays.
The login form however doesn't work. A successful login returns an OK but the if statement fails and instead of a nicely formatted success message I just get the OK displayed without the username and password fields being hidden which is what makes me think the IF is failing although I cannot see why it would.
I've been staring at this code for hours now and all I can see is the same code for both and no idea why one is working and one is not ....
On to the code...Here is the Login javascript:
$("#ajax-login-form").submit(function(){
var str = $(this).serialize();
$.ajax({
type: "POST",
url: "php/login.php",
data: str,
success: function(msg) {
$("#logNote").ajaxComplete(function(event, request, settings) {
if(msg == 'OK') {
// Display the Success Message
result = '<div class="alertMsg success">You have succesfully logged in.</div>';
$("#ajax-login-form").hide();
$("#swaptoreg").hide();
$("#resetpassword").hide();
} else {
result = msg;
}
// On success, hide the form
$(this).hide();
$(this).html(result).slideDown("fast");
$(this).html(result);
});
}
});
return false;
});
and here is the register javascript:
$("#ajax-register-form").submit(function(){
var str = $(this).serialize();
$.ajax({
type: "POST",
url: "php/register.php",
data: str,
success: function(msg) {
$("#regNote").ajaxComplete(function(event, request, settings) {
if(msg == 'OK') {
// Display the Success Message
result = '<div class="alertMsg success">Thank you! Your account has been created.</div>';
$("#ajax-register-form").hide();
} else {
result = msg;
}
// On success, hide the form
$(this).hide();
$(this).html(result).slideDown("fast");
$(this).html(result);
});
}
});
return false;
});
I don't think I need to add the php here since both just end with an echo 'OK'; if successful and since I'm seeing the OK instead of the nicely formatted success message I'm confident that it is working.
Any suggestions?
EDIT: Here's the login php:
<?php
require("common.php");
$submitted_username = '';
$user = stripslashes($_POST['logUser']);
$pass = stripslashes($_POST['logPass']);
if(!empty($_POST))
{
$query = "
SELECT
id,
username,
password,
salt,
email
FROM users
WHERE
username = :username
";
$query_params = array(
':username' => $user
);
try
{
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}
catch(PDOException $ex)
{
die("Failed to run query ");
}
$login_ok = false;
$row = $stmt->fetch();
if($row)
{
$check_password = hash('sha256', $pass . $row['salt']);
for($round = 0; $round < 65536; $round++)
{
$check_password = hash('sha256', $check_password . $row['salt']);
}
if($check_password === $row['password'])
{
$login_ok = true;
}
}
if($login_ok)
{
unset($row['salt']);
unset($row['password']);
$_SESSION['user'] = $row;
echo 'OK';
}
else
{
echo '<div class="alertMsg error">Incorrect username or password</div>';
$submitted_username = htmlentities($_POST['username'], ENT_QUOTES, 'UTF-8');
}
}
?>

if($login_ok)
{
unset($row['salt']);
unset($row['password']);
$_SESSION['user'] = $row;
echo 'OK';
}
else
{
echo '<div class="alertMsg error">Incorrect username or password</div>';
$submitted_username = htmlentities($_POST['username'], ENT_QUOTES, 'UTF-8');
}
}
?> <!------- There is a space here! -->
There is a space after the closing ?> which is being sent to the user. The closing ?> is optional, and it is highly recommended to NOT include it, for just this reason. Get rid of that ?>.